参数资料
| 型号： | DM300022 |
| 厂商： | Microchip Technology |
| 文件页数： | 30/56页 |
| 文件大小： | 0K |
| 描述： | MODULE PWR DSPICDEM MC1L LV 3PHS |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电机控制 |
| 嵌入式： | 是，MCU，16 位 |
| 已用 IC / 零件： | dsPIC33FJxxxMC |
| 主要属性： | 3 相低压电源模块 |
| 次要属性： | 运动传感器输入：霍尔传感器或光学编码器 |
| 已供物品： | 子板 |
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dsPICDEM? MC1L 3-Phase Low Voltage Power Module
The hardware for providing this is now discussed with reference to the RED phase.
The other two phases have identical circuits.
? R20, R21 and R144 – A resistor divider chain with scaling, the same as the DC
voltage feedback. The same scaling is required in order that the "back EMF
crossing" detection works correctly. The scaling is such that the maximum
expected output voltage will give 4.5V.
? C61 – This provides filtering of the inverter output voltage in combination with
R20, R21 and R144.
? D41 – This provides a clamp to ensure R_VPH_SENSE is protected.
? U31-B – A comparator used to provide a simple sensorless position detection
scheme for BPM motors. Whenever R_PH crosses half the DC bus voltage, an
output transition will occur. The R_CROSSING signal is only valid during regions
of the electrical cycle, where the RED phase output current is zero, so that the
back EMF of the motor determines the voltage of R_VPH. Thus the scheme is
only suitable for use on BPM motors where 120 degree conduction scheme is
used. Careful decoding of all three crossing signals and appropriate angle interpo-
lation is required for correct commutation. An alternative method for commutation
feedback must be used near zero speed where the back EMF is insufficient for the
scheme to work.
? R143, R147 – these provide a small amount of hysteresis to prevent oscillation of
R_CROSSING.
? R142 – the pull-up resistor for the open-collector output of the comparator.
1.5.8
1.5.8.1
Firing Signal Isolation and Low Voltage Power Supplies
INTRODUCTION
The choice of isolation strategy and how the low voltage power supplies are to be
derived are two of the major decisions that determine the architecture of a motor drive
controller. For this design, the requirement was for flexibility while maintaining user
safety. It was essential that the system could work off a wide range of input voltages.
Although the system only operates off comparatively low voltages, fault currents can
be very high. Furthermore, given the common PCB with the high voltage version of
the system, a similar isolation strategy was used.
1.5.8.2
FIRING SIGNAL ISOLATION (APPENDIX A SHEET 5)
Either optical or transformer-based isolation strategies can be used for transmitting
gate firing commands. For this design, it was decided to use optocouplers as it was
possible that a particular firing command may be used for commutation as opposed to
high frequency modulation. This could lead to transformer saturation at low speeds.
The hardware implemented is described below:
? U6-U13 – 6N136 optocouplers. These parts were chosen to provide good noise
immunity, while requiring low current consumption on the output side. Speed was
also a consideration, so that too much delay or pulse distortion was not
introduced.
? R153-R160 – pull-up resistors for the open collector outputs of the optocouplers.
? R162-169 – series resistors to ensure at least 18 mA flows through the emitter
stage of the optocouplers. Note that the ground return is via a transistor (Q15) that
allows shutdown during detection of an over-current from one of the isolated Hall
effect current transducers.
? U32 and U33 – Schmitt-triggered inverters which clean up the edges from the
outputs of the optocouplers.
DS70097A-page 24
? 2003 Microchip Technology Inc.
相关PDF资料 |
PDF描述 |
|---|---|
| DM320002 | BOARD EXPANSION PIC32 I/O |
| DM320003-2 | KIT EVAL PIC32 USB II STARTER |
| DM320003 | BOARD DEMO USB PIC32 OTG |
| DM320005 | BOARD EXPANSION FOR PIC32 KIT |
| DM320011 | BOARD AUDIO DEV FOR PIC32 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM300023 | 功能描述:开发板和工具包 - PIC / DSPIC dsPICDEM SMPS Buck Demo Brd RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM300024 | 功能描述:开发板和工具包 - PIC / DSPIC dsPICDEM 1.1 GP RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM300027 | 功能描述:开发板和工具包 - PIC / DSPIC 16-bit Starter Demo Board RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM-3-000-K | 制造商:PacTec 功能描述:Case, Plastic; ABS; Black; 11.46 in.; 3.38 in.; 10.4 in.; UL 94-HB Rated 制造商:PacTec 功能描述:ENCLOSURE, DESKTOP, PLASTIC, BLACK; Enclosure Type:Desktop; Enclosure Material:Plastic; Body Color:Black; External Height - Imperial:3.38"; External Height - Metric:86mm; External Width - Imperial:10.4"; External Width - Metric:264mm;RoHS Compliant: Yes |
| DM-300-C | 制造商:Greenlee Textron Inc 功能描述:DMM 1000V RMS |
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